DI UMa superoutburst? ER UMa-type. This object appears to show a short supercycle as in the past RZ LMi. Systematic observations are desired. YYYYMMDD(UT) mag observer 20170430.564 <160c (Mitsutaka Hiraga) 20170503.542 <157c (Mitsutaka Hiraga) 20170516.503 151c (Mitsutaka Hiraga)